Fuel control for boillers



Fox. n FUEL `CONTROL FOR BOLERSf- APPLICAHON FILED )UNE Hi, 1919A Patented July www5@ o. Fox. FUEL CONTROL FOR BOILEHS.' APPLICATION FILED JUNE I6, 1919..

'UNI-'ran .PA- vif-13N'r4 opplcE--,

or'ro FOX, or. LAKEWOOD, omanssIGNoR-.ro 'rnnnnym imams. ANDJMANtn; i FACTURING comrmvgon cLEvnLAivn, omo, A companion cromo.;

l 'A1-application led J-une' 1G, 1919. Serial No. 304,365.

the'United -States, residingat-Lakewood, in

the county of Cuyahoga and State of Ohio, have inventedav'cefrtain new'iand useful Improvement in Fuel'Cont'ro'l's for Boilers,o f which the following isa full, clear', and

l exact description.l

This invention relates .to afuel control for boilers which are heated 4by gas, and' in` one aspectit relates to a fuel control wherein f Specicaton'of Letters Patent.

atenten 'Juiy 12, 1921.

gas'supplie'd through a pipe-11 havin-g'suit-.Lfl

fable burner connections indicated at 12 in Fig. 1. The boileris shown provided with the usual gage glass 10a and trifcocks'10, ibut these. are immaterial to my invention.-v In the pipe 11 there is an automatic gas shut-off valve which in this instance includes Fig. carrying a. movable valve member 15, designed to engage an annular seat 16,

`When there is what may be termed no presthesupply of gas, is shut oil when the water sure above vthe diaphragm, the valve is open,I -in the `'boiler .reaches a predetermined low l level. In' another aspect the invention relates to the combination of thev low water shutoff with' a steam control wherein .through the same instrumentality which is utilized in the l'owv water control, steam at a given 'pressure shuts off the flow of gas. 20

The principal Yobject of the invention is to 'providea fuel-control for the purpose or purposes above named, which as consisting in certain novel detailsl of construction, and combinations and arrange ments of parts which will be described in the specification and set forth in the ap pended claims. v

Though the invention is not limited to a Vconstruction providing both for the low water and steam pressure controls, 'but is capable of being embodied in apparatus wherein it is designed to be used solely s a low water control, nevertheless my'inveIlion finds its greatest utility in apparatus havinfr 1,

the dual functions, and such'embodiment .have illustrated in thel drawings, wherin Figure 1 is an elevation of a boiler equipped with a fuel control such as outlined above; Fig. 2 is an enlarged view partly in section,

showing the main valve designed to be op-f erated on the occurrence of low 'water or predetermined steam pressure in the boiler, together with certain parts which coperate therewith; Fig. 3 is a sectional view of a float chamber containing a float which operates a-valve for the control of gas which is utilized to operate the shutoff valvewhen the water reaches a predetermined` low level; and Fig. 4 is a-sectional view substantially 'along the line 4-4 of Fig. 3.

Referring now to the drawings, 10 represents a boiler which may be of any suitable construction, this boiler being heated by is eficient,

'gas pressure is admitted to th'e top ofthe diaphragm the valve is closedwith a' snap a casing 13, containing a diaphragm 14 `,(see

action.- In accordance with the present invention gas is supplied to the top of the diaphragm through instrumentalities controlled'by the water level and steam pres-` sure as will next be'explained.

It might be mentioned at this point before i describing, the manner in which this valve is controlled, that while a main shut-off valveof the diaphragm type is preferred,

nevertheless the invention in its broad aspects is not confined to a shut-off valve of j that type. It may here be stated also, that. in -some of the appended claims the shut-ofi valve is defined as having amovable wall,` and in the embodiment shown the movable wall referred to is formed by the dia*-v Taking up now the devices by which, and the manner in which the shut-off valve is closedwhen the water reaches a predeter mined low level, it will be observed that a b v-pass pipe 17 is connected to the inlet side of the valve chamber 13 and extends to a pilot burner 18.` A pipe 19 extends upwardly from this by-pass pipe 17 to the bottom of a valve chamber-20, containing a movabley valve member 21 which is normally closed. A .pipe 22 extends from the side of the valve chamber downwardly to a pipe 2f@ .leading to the upper part of the chamber 13 of the main shut-ofi valve so that when the valve in the chamber 20is opened, gas is supplied b v the pipes 17, 19,122 and 23 above the diaphragm 14 so as to cause the closure of the shut-ofi' valve. A pilot burner 24 is connectedto the pipe 23 as shown in Figs. '1 and 2. This pilot burner 24 is provided simply as open, l 'with gas whether the shut-off valve is open ror-closed.

" v Fbnlthe control of the a convenientineans for disposing of the eX- cessfgas suppliedfto theupper part of the Chamber 13 l whenV the shut-oii'valve is closed. It receives: .no gaswhen the shut-'oft valve is though `thepilotburner 18 is supplied pass piping I provide a float chamber 25 'connected-by piping 26 'and 27 to the steam `and water sidesl of the boiler so\that the Vwater level in the chamber will be the same 'as the waterlevel in the boiler., This cham-` f ber contains a ifioat 28 (see'Fig. 3) 'which is connected` to a pivoted arm 29, extending laterally through an extension of the iioat chamber and's'ecured to apin or stud y SOYsuitably supportedl in saidextension and .ward

spring 33 (shown @It willi'be seen -Wmr yprovided with a valve operating linger 31 which is 'above apin 32 connected to the valvelmember 21 in'valve chamber`20. `A jnFig. 3) closes this valve. therefore, that when the the boiler reaches 'a predetermined lowlevehcausingthe ioat'to move downto al predetermined point,YY the Vvalve member21 is' opened or moved away from [its vseat so. as to allow-the gas to .ass from ,',upon this valve' isquickly'v closed. It will4 Y inspires;

11 VVand 19 throug'h the va ve chamber` 2O and by the pipes 22 and 23 and into the upper partfof the chamber 13 above the diaphragm 14 of the shut-oil' valve wherebe seen also,that when-the water level rises the valve member 21 will be moved to close .i position, Avstoppi1 ig'the flow of gas' throughv thechamber 20 is closed by Athe' water level.

the by-passI p ipin'g and allowing the pressure above the diaphragm to be relieved and the shut-oli' valve to open. As long as the low water'level in the boiler continues, the gasv {iows through the' by-pass piping and valve chamber 20', the excess gas over that reuired to maintain the .pressure above the iaphragm passing to theI pilot" burner 24 and being consumed, and when the valvein rising, the pressure above the diaphragm is relieved through the pilot burner 24,'

I believe it is new with me to provide a gas shut-oil` valve with a pressure responsive device,` in this instance a` diaphragm, and which is shifted to cause the closure of the valve by gas controlled by a valve operated by a iioat or equivalent means, and this subject matter` intend tol claim broadly irrespective loi"V the type or form of shut-off valve, and without regard to whether or not .the shutoff valve is closed also on the occurrence of predetermined steam pressure.

The steam pressure control of the main shut-oft' valve is effected by means of a pipe --34extending from the piping 26 downward tothe upper part of a diaphragm chamber 35 containing a diaphragm 36 connected', to

aplunger 37, norm-ally held upward by a 'Valve 2in1 this by! weighted lever 38. By reference to Fig. 2 it will be seenthat-the plunger 37 connected to the diaphragm 36`is directly-.above a valve :plunger 3.9 eonnected to a valve member 38 which is normally held against the valve Aseat by a spring 40. When this valve is open, gas may pass from* the inlet side of the valve chamber .13 throng-han. opening -14ain thediaphragm 14 andby,way of a A passageway A41 (see Fig. 2), to the interior lof the chamber above`the diaphragm 14, thus closing the shut-oli' valve witha snap action.Y `This occurs when the steam'fpressure reaches avvalue such that .the pressure Y on the diaphragm overcomestheforceacting in the opposite direction to the weighted lever, and lowers' the plunger-and valve pin 39. The gas continues to flow.l to the upper part of the chamber 13, and out through the Ypipe 23 'and pilot burner 24 as long as the" steam' pressure is l above4 a predetermined value,4 bit "whenl the pressure. drops, the valve member 38l is closed, thus .relieving the pressure above the diaphragm and-permitting the gas pressure-.inthe main pipe to again open the shutoffvl valve.

Thus shouldvthe water inthe boiler reach lieved, the valve is again opened by pressure of the gas. c The apparatus which I have provided is not only eflicient but it is reliable in action over 'a long period of time, the construction and operation being such that the parts are not liable to get out of order.

l aim in my claims to cover all; modifica tions which do not involve a departure from ythe spirit andscope of my invention in its' broadest aspects.

Having descri gas supply pipe, a shut-oil' valveA in said pipe provided with a pressure responsive4 device forI closing the same, a normally closed connection between the gas supply pipe and the pressure responsive device, and

bed my invention, I claimz' 1. In combination with aboiler having a V means whereby lwhen the water in the boiler reaches a predetermined low. level said connection is opened' so as to permitv the shutoii valve to be closed by gas pressure.V

- 125 2. In combination with a boiler having'a iloat chamber containing a float, and havling. a 4gas supply pip'e, a shut-ofi' valve in said pipeprovided with a pressure respon;

sive device for closing the saine, a normally iso closed connection between the gas supply pipe and the pressure responsive' device, a valve inl said connection, and means Whereby the float opens said valve when the Water reaches a. predetermined level in the boiler.

3. In combination with a boiler having a gas supply pipe, a shut-oli valve in said pipe provided with a pressure responsive device for closing the same, by-pass piping between the gas supply pipe land said pressure responsive device, said piping having a normally closed valve, and means for open ing said valve when the Water in the boiler reaches a predetermined low level.

4. In combination Witha boiler having a gas supply pipe, a shut-oil valve in said pipe having a valve member and a movable wall carrying the same, and means controlled by the Water level in the boiler for admitting gas from said. supply pipe to one side of said movable wall so as to close the Said valve.

5. In combination with a boiler having a gas supply pipe, an automatic shut-olf valve 1n said pipe, said valve having a movable vWall forming a chamber, piping for supplying gas from the gas supply pipe to said chamber, said piping having a normally closed valve, .and 'means whereby the saidV valve is opened when the Water in the boiler reaches-a predetermined low level.

6. In combination with a boiler having a gas supply pipe, an automatic shut-oi`f valve in said pipe, said valve having a movable Wall forming a chamber, piping for supplying gas from the gas supply pipe to said chamber, said piping having a normally closed valve, and means whereby the said valve is opened when the Water in the boiler gas pressure therein when the Water levelin the boiler rises.

7. In combination with a boiler having a gas supply pipe, a shut-off valve in said pipe having a pressure responsive device, means including normally closedvalves for supplying gas 'from the gas supply 'pipe to the pressure responsive device, means Whereby one of said normally closed valves is opened when the steam in the boiler reaches a predetermined pressure, and means Whereby the other normally closed valve is opened when' the water in the boiler reaches a predetermined low level,

8. In combination with a boiler having a gas supply pipe, an automatic shut-off valve in said pipe, including a movable Wall forming al gas chamber normally free of gas pressure, and devices controlled respectively by steam pressure and by the Water level in the boiler for admitting gas to said chamber to close the' valve.

9. In combination with a boiler having a gas supply pipe, a shut-off valve in said pipe having a movable Wall carrying a valve member, said Wall being subjected on one side to the pressure of gas in the supply pipe', the opposite side of'said Wall being normally relieved of gas' pressure, and means for supplying gas to theopposite side of said Wallwhen the steam reaches al predetermined pressure and when the water in the boiler reaches a predetermined loW level.

In testimony whereof, I hereunto allix my 

